<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div ng-app="myApp" ng-controller="myCtrl">

        <ul>
            <li ng-repeat="x in counts">
                {{ x | myFormat}}
            </li>
        </ul>
    </div>
    <script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
    <script>
        var app = angular.module("myApp", []);
        app.service('hexafy', function() {
            this.myFunc = function(x) {
                return x.toString(10);
            }
        })
        app.filter('myFormat', ['hexafy', function(hexafy) {
            return function(x) {
                return hexafy.myFunc(x);
            }
        }]);
        app.controller('myCtrl', function($scope) {
            $scope.counts = [255, 251, 200];
        });
    </script>
</body>

</html>